1 files changed, 100 insertions, 0 deletions
diff --git a/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/KeyPairGeneratorSpi.java b/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/KeyPairGeneratorSpi.java
new file mode 100644
index 00000000..9c92b575
--- /dev/null
+++ b/prov/src/main/java/org/spongycastle/jcajce/provider/asymmetric/elgamal/KeyPairGeneratorSpi.java
@@ -0,0 +1,100 @@
+package org.spongycastle.jcajce.provider.asymmetric.elgamal;
+
+import java.security.InvalidAlgorithmParameterException;
+import java.security.KeyPair;
+import java.security.SecureRandom;
+import java.security.spec.AlgorithmParameterSpec;
+
+import javax.crypto.spec.DHParameterSpec;
+
+import org.spongycastle.crypto.AsymmetricCipherKeyPair;
+import org.spongycastle.crypto.generators.ElGamalKeyPairGenerator;
+import org.spongycastle.crypto.generators.ElGamalParametersGenerator;
+import org.spongycastle.crypto.params.ElGamalKeyGenerationParameters;
+import org.spongycastle.crypto.params.ElGamalParameters;
+import org.spongycastle.crypto.params.ElGamalPrivateKeyParameters;
+import org.spongycastle.crypto.params.ElGamalPublicKeyParameters;
+import org.spongycastle.jce.provider.BouncyCastleProvider;
+import org.spongycastle.jce.spec.ElGamalParameterSpec;
+
+public class KeyPairGeneratorSpi
+    extends java.security.KeyPairGenerator
+{
+    ElGamalKeyGenerationParameters param;
+    ElGamalKeyPairGenerator engine = new ElGamalKeyPairGenerator();
+    int strength = 1024;
+    int certainty = 20;
+    SecureRandom random = new SecureRandom();
+    boolean initialised = false;
+
+    public KeyPairGeneratorSpi()
+    {
+        super("ElGamal");
+    }
+
+    public void initialize(
+        int strength,
+        SecureRandom random)
+    {
+        this.strength = strength;
+        this.random = random;
+    }
+
+    public void initialize(
+        AlgorithmParameterSpec params,
+        SecureRandom random)
+        throws InvalidAlgorithmParameterException
+    {
+        if (!(params instanceof ElGamalParameterSpec) && !(params instanceof DHParameterSpec))
+        {
+            throw new InvalidAlgorithmParameterException("parameter object not a DHParameterSpec or an ElGamalParameterSpec");
+        }
+
+        if (params instanceof ElGamalParameterSpec)
+        {
+            ElGamalParameterSpec elParams = (ElGamalParameterSpec)params;
+
+            param = new ElGamalKeyGenerationParameters(random, new ElGamalParameters(elParams.getP(), elParams.getG()));
+        }
+        else
+        {
+            DHParameterSpec dhParams = (DHParameterSpec)params;
+
+            param = new ElGamalKeyGenerationParameters(random, new ElGamalParameters(dhParams.getP(), dhParams.getG(), dhParams.getL()));
+        }
+
+        engine.init(param);
+        initialised = true;
+    }
+
+    public KeyPair generateKeyPair()
+    {
+        if (!initialised)
+        {
+            DHParameterSpec dhParams = BouncyCastleProvider.CONFIGURATION.getDHDefaultParameters(strength);
+
+            if (dhParams != null)
+            {
+                param = new ElGamalKeyGenerationParameters(random, new ElGamalParameters(dhParams.getP(), dhParams.getG(), dhParams.getL()));
+            }
+            else
+            {
+                ElGamalParametersGenerator pGen = new ElGamalParametersGenerator();
+
+                pGen.init(strength, certainty, random);
+                param = new ElGamalKeyGenerationParameters(random, pGen.generateParameters());
+            }
+
+            engine.init(param);
+            initialised = true;
+        }
+
+        AsymmetricCipherKeyPair pair = engine.generateKeyPair();
+        ElGamalPublicKeyParameters pub = (ElGamalPublicKeyParameters)pair.getPublic();
+        ElGamalPrivateKeyParameters priv = (ElGamalPrivateKeyParameters)pair.getPrivate();
+
+        return new KeyPair(new BCElGamalPublicKey(pub),
+            new BCElGamalPrivateKey(priv));
+    }
+}
+